Dissertations / Theses on the topic 'Hartree-Fock-Bogoliubov'
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Lang, Georg Robert. "Methoden der Hartree-Fock-Bogoliubov-Theorie." [S.l.] : [s.n.], 2003. http://edocs.tu-berlin.de/diss/2003/lang_georg.pdf.
Full textPaul, Séverine. "Modèle de Hartree-Fock-Bogoliubov : une perspective théorique et numérique." Phd thesis, Université de Cergy Pontoise, 2012. http://tel.archives-ouvertes.fr/tel-00752813.
Full textYu, Yongle. "Renormalization of Hartree-Fock-Bogoliubov equations in case of zero range interaction /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/9641.
Full textHeinrich, Sophie. "Développement d'un nouveau modèle de point de scission basé sur des ingrédients microscopiques." Paris 11, 2006. http://www.theses.fr/2006PA112247.
Full textNucleus fission process is a very complex phenomenon and, even nowadays, no realistic models describing the overall process are available. The work presented here deals with a theoretical description of fission fragments distributions in mass, charge, energy and deformation. We have reconsidered and updated the B. D. Wilking Scission Point model. Our purpose was to test if this statistic model applied at the scission point and by introducing new results of modern microscopic calculations allows to describe quantitatively the fission fragments distributions. We calculate the surface energy available at the scission point as a function of the fragments deformations. This surface is obtained from a Hartree Fock Bogoliubov microscopic calculation which guarantee a realistic description of the potential dependence on the deformation for each fragment. The statistic balance is described by the level densities of the fragment. We have tried to avoid as much as possible the input of empirical parameters in the model. Our only parameter, the distance between each fragment at the scission point, is discussed by comparison with scission configuration obtained from full dynamical microscopic calculations. Also, the comparison between our results and experimental data is very satisfying and allow us to discuss the success and limitations of our approach. We finally proposed ideas to improve the model, in particular by applying dynamical corrections
Li, Jia Jie. "Finite nuclei under extreme conditions of mass, isospin and temperature : a relativistic Hartree-Fock-Bogoliubov description." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112220/document.
Full textThe covariant density functional (CDF) theory with a few number of parameters has been successfully employed to describe ground-state and excited-states of nuclei over the entire nuclear landscape for A > 12. It describes finite nuclear systems with a universal hadronic Lagrangian, which is solved considering the relativistic-Hartree-Fock-Bologuibov approach (RHFB). This model is also employed for the study of compact stars, since it can be extended to high densities where special relativity cannot be ignore. This model can also be extended to include the contribution of hyperons and as well as other exotic particles. In this work, the description and some predictions based on RHFB approach for nuclei under extreme conditions of mass, isospin and temperature are presented.In the first part, we explore the occurrence of spherical shell closures for superheavy nuclei, where shell closures are characterized in terms of two-nucleon gaps. The results depend slightly on the effective Lagrangians used, but the magic numbers beyond ^{208}Pb are generally predicted to be Z = 120 and 138 for protons, and N = 172, 184, 228, and 258 for neutrons. Shell effects are sensitive to various terms of the mean-field, such as the spin-orbit coupling, the scalar and the effective masses, as well as the Lorentz-tensor interaction. These terms have different weights in the effective Lagrangians employed, explaining the (relatively small) variations in the predictions. Employing the most advanced RHFB model, we founded that the nuclide ^{304}120 is favored as being the next spherical doubly-magic nucleus beyond ^{208}Pb.In the second part, we investigate the formation of new shell gaps in intermediate mass neutron-rich nuclei, and analyze the role of the Lorentz pseudo-vector and tensor interactions. Based on the Foldy-Wouthuysen transformation, we discuss in detail the role played by the different terms of the Lorentz pseudo-vector and tensor interactions in the appearance of the N=16, 32 and 34 shell gaps. The nuclei ^{24}O, ^{48}Si and ^{52,54}Ca are predicted with a large shell gap and zero (^{24}O, ^{52}Ca) or almost zero (^{48}Si, ^{54}Ca) pairing gap, making them candidates for new magic numbers in neutron rich nuclei. We find that the Lorentz pseudo-vector and tensor interactions induce very specific evolutions of single-particle energies, which could clearly sign their presence and reveal the need for relativistic approaches with exchange interactions.In the last part, we study the phase transitions and thermal excitations of both stable and weakly-bound nuclei. The predictions of various relativistic Lagrangians and different pairing interactions are discussed. The critical temperature of the pairing transition is found to depend linearly on the zero-temperature pairing gap, and this dependence is similar for a zero-range or a finite-range pairing interaction. The present calculations show interesting features of the pairing correlations at finite temperature, such as the pairing persistence and pairing re-entrance phenomena. Also, we analyze the thermal response of some nuclei.In conclusion, the work presented in this thesis shown interesting and new results for three of the most important questions in nuclear physics: the quest for a new island of stability in the superheavy region, the appearance of new magic numbers in exotic nuclei, and the response of finite-systems to thermal excitations
Dancer, Héloïse. "Une symétrie brisée dans le formalisme de Hartree-Fock-Bogoliubov : la z-signature : applications à la dynamique des noyaux déformés." Lyon 1, 2000. http://www.theses.fr/2000LYO10139.
Full textEbran, J. P. "Description relativiste de l'état fondamental des noyaux atomiques par l'approche du champ moyen auto-cohérent, incluant la déformation et la superfluidité." Phd thesis, Université Paris Sud - Paris XI, 2010. http://tel.archives-ouvertes.fr/tel-00565208.
Full text山上, 雅之. "対称性の制限の無いSkyrme-Hartree-Fock-Bogoliubov法による不安定核のエキゾチック変形の研究." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150391.
Full textChappert, Frédéric. "Nouvelles paramétrisations de l'interaction nucléaire effective de Gogny." Phd thesis, Université Paris Sud - Paris XI, 2007. http://tel.archives-ouvertes.fr/tel-00177379.
Full textcalculs microscopiques de structure nucléaire. L'une des formes utilisée
depuis les années 1970 est la force effective phénoménologique proposée par
D. Gogny. Cette force donne d'excellents résultats dans les noyaux à
l'approximation du champ moyen. La présence de composantes de contact ne
permet pas cependant de l'employer en toute généralité pour décrire les
corrélations au-delà du champ moyen qui se manifestent fréquemment dans les
noyaux.
Dans ce travail, nous étudions des extensions de la force de Gogny, notamment
une généralisation où le terme dépendant de la densité de portée nulle est
remplacé par un terme de portée finie. Les paramètres intervenant dans la forme
analytique de la force sont ajustés sur les propriétés de la matière nucléaire
infinie symétrique et de la matière neutronique, et sur les observables globales
de quelques noyaux stables, en particulier celles associées aux corrélations
d'appariement. Nous présentons la méthode permettant d'inclure ce type de
force dans les codes de calcul Hartree-Fock-Bogoliubov et nous analysons les
résultats obtenus dans de nombreux noyaux. Les nouvelles versions de la force
de Gogny apparaissent reproduire la structure nucléaire avec une qualité égale
ou supérieure à la version traditionnelle.
Wuester, Sebastian, and sebastian wuester@gmx net. "Classical and Quantum Field Theory of Bose-Einstein Condensates." The Australian National University. Faculty of Science, 2007. http://thesis.anu.edu.au./public/adt-ANU20070802.161045.
Full textVerrière, Marc. "Description de la dynamique de la fission dans le formalisme de la méthode de la coordonnée génératrice dépendante du temps." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS113/document.
Full textNuclear fission, where an atomic nucleus separates into two fragments while emitting a large amount of energy, is at the core of many applications in society (energy production) and national security (deterrence, non-proliferation). It is also a key ingredient of the mechanisms of formation of elements in the universe. Yet, nearly 80 years after its experimental discovery its theoretical description in terms of the basic constituents of the nucleus (protons and neutrons) and their interaction remains a challenge. In this thesis, we describe the fission process as follows. In a first step, we use large supercomputers to compute the deformation properties of the nucleus based on our knowledge of nuclear forces. In a second step, we simulate the time evolution of the system from its ground state up to the fragments separation with a fully quantum-mechanical approach called the time-dependent generator coordinate method (TDGCM). While results are in good qualitative agreement with experimental data, the implementation of the TDGCM so far had been greatly simplified using what is known as the Gaussian overlap approximation (GOA). We also developed the formalism and a numerical implementation of the exact TDGCM - without the GOA. This will allow the first systematic validation of that approximation and an assessment of the resulting theoretical uncertainties. The second chapter presents the description of the neutron induced fission process using the TDGCM+GOA. The third one introduces the developments carried out in this thesis allowing the description of the fission process with the TDGCM without the GOA. The last chapter shows the first results obtained with this approach
Grente, Lucie. "Structure des fragments de fission de masse A = 100 - 110 : mesures de temps de vie et analyses en champ moyen et au-delà." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112216/document.
Full textNeutron-rich nuclei of mass A=100-110 are of great interest for the study of nuclear structure far from stability. Previous experimental and theoretical studies suggest a complex evolution of deformation and collectivity in the isotopic chains of Zr, Mo, Ru and Pd.In order to extend information on the evolution of the collectivity towards higher spin states and more neutron-rich nuclei, lifetimes of excited states were measured in nuclei produced through a fusion-fission reaction in inverse kinematic at GANIL. Fission fragments were separated and identified in both A and Z with the high acceptance magnetic spectrometer VAMOS while the EXOGAM germanium detectors array was used for the coincident gamma-ray detection. Lifetimes of about twenty excited states were extracted using the plunger device of Cologne. This is the first RDDS measurement on fission fragments which are identified in A and Z on an event-by-event basis. The study of this mass region is completed by theoretical calculations using self consistent mean field and beyond mean field methods implemented with the Gogny force (D1S). The structure of the ground states and the excited states is described with Hartree-Fock-Bogoliubov calculations with constraints placed on the axial and triaxial deformations. Individual excitations are investigated through blocking calculations and the high spin states are studied through cranking calculations. Finally, an approximated generator coordinate method (GCM+GOA) using the 5DCH hamiltonian is used to describe the low energy collective states and to interpret the experimental evolution of the collectivity
Avez, Benoît. "Mouvements collectifs dans les noyaux : des vibrations à la fusion." Phd thesis, Université Paris Sud - Paris XI, 2009. http://tel.archives-ouvertes.fr/tel-00492067.
Full textMinaya, Ramirez Enrique. "Un nouveau piège à ions circulaire pour la spectrométrie de masse et la structure nucléaire." Phd thesis, Université Paris Sud - Paris XI, 2009. http://tel.archives-ouvertes.fr/tel-00421111.
Full textLewin, Mathieu. "Systèmes quantiques à grand nombre de particules :une perspective mathématique et numérique." Habilitation à diriger des recherches, Université de Cergy Pontoise, 2009. http://tel.archives-ouvertes.fr/tel-00394205.
Full textUne première partie contient quelques résultats pour des systèmes finis. Nous étudions des approximations de l'équation de Schrödinger pour N électrons dans une molécule ou un atome, puis le modèle de Hartree-Fock-Bogoliubov pour un système de fermions interagissant avec une force de type gravitationnelle.
Dans une seconde partie nous proposons une nouvelle méthode pour démontrer l'existence de la limite thermodynamique pour des systèmes quantiques interagissant avec la force de Coulomb.
Ensuite, nous construisons deux modèles de type Hartree-Fock pour des systèmes infinis. Le premier est un modèle relativiste, déduit de l'électrodynamique quantique, et qui permet de décrire le comportement d'électrons, couplés avec celui du vide de Dirac qui peut se polariser. Le second modèle décrit l'état d'un cristal non relativiste en présence d'un défaut chargé ; il est complété par une nouvelle approche numérique.
La dernière partie du mémoire est consacrée au problème de pollution spectrale, un phénomène observé lorsque l'on cherche à calculer des valeurs propres au milieu du spectre essentiel, par exemple pour des opérateurs de Dirac ou de Schrödinger périodique.
Samyn, Mathieu. "Improved nuclear predictions of relevance to the r-process of nucleosynthesis." Doctoral thesis, Universite Libre de Bruxelles, 2004. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211170.
Full textTeran, Balbuena Edgar. "Hartree-Fock-Bogoliubov calculations for nuclei far from stability." 2003. http://etd.library.vanderbilt.edu/ETD-db/available/etd-03312003-163407/.
Full textLang, Georg Robert [Verfasser]. "Methoden der Hartree-Fock-Bogoliubov-Theorie / vorgelegt von Georg Robert Lang." 2003. http://d-nb.info/968308325/34.
Full textTsuchimochi, Takashi. "Describing strong correlations with mean-field approximations." Thesis, 2012. http://hdl.handle.net/1911/64684.
Full textBlazkiewicz, Artur Robert. "2D coordinate space Hartree-Fock-Bogoliubov calculations for neutron-rich nuclei in the A [approximately equal to] 100 mass region." Diss., 2005. http://etd.library.vanderbilt.edu/ETD-db/available/etd-11172005-164432/.
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